Fuel-saving attachment for furnaces



N. 1, RUSSELL. FUEL SAVING ATTACHMENT FOR FURNACES.

APPLICATION FILED DEC- 5,1919.

Patented June 7 1921.

UNHTE STAT FAWN? @FFHQE.

FUEL-SAVING ATTACHMENT FOR FURNACES.

Specification of Letters Patent.

Patented June 7, 1921.,

Application filed December 5, 1919. Serial No. 342,744.

7 '0 all whom it may concern:

Be it known that I, NELSON J. RUssnLL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use ful Improvements in F uel-Saving Attachments for Furnaces, of which the followin is a specification.

y present. invention relates to improvements in fuel saving attachments for furnaces of a type somewhat similar to that disclosed in Letters Patent of the United States, Number 1,205,? 89, issued to me on November 21, A. D., 1916, and has for one of its objects to greatly improve, simplify, and render more practical the construction of such devices made according to my aforesaid Letters Patent, and to economize in the amount of material used in the construction of the devices set forth in said Letters Patent, without deleteriously diminishing its strength or efiiciency and with less amount of labor and time expended in the production of the attachments.

Further objects and advantages of'the invention are similar to those set forth in my aforesaid Letters Patent and are as follows:

To provide an extremely simple and inexpensive device for admitting, heating and discharging or distributing atmospheric air into furnaces, such as stoves, ranges, bake ovens, boiler-furnaces and the like, in'such a manner that the supply of air to the furnaces, will, through the medium of the device, be heated to a high degree of temperature, and in such condition discharged or distributed in the furnace, and by preference, in the fire box or pot thereof, to commingle with the combustible and volatile gases emanating from the burning fuel, where said heated air will be utilized to increase from a given amount of fuel, the combustion of the combustible ases, or of the free carbon released during t e burning of such fuel, thereby avoiding to a marked degree, the formation of smoke, yet attaining the maximum amount of heating units from the fuel, for it is a Well known fact that smoke is due to a lack of air at the proper temperature at the point where the volatile gases should be consumed.

Another object of the invention is to pro vide an attachment of the above described general character, which, if desired, may be readily attached to the door of a stove, furnace or range leading to the fire box thereof,

in such a manner that it will not interfere w th the opening or closing of the door, or w1th feeding fuel to the grate of the fire box, or if desired, said attachment may be mounted within the furnace in a stationary or immovable manner.

A still further object is to provide a fuel saving attachment for furnaces which shall be of such construction and arrangement of 1ts' parts as to be readily cast or formed of a single piece of material, if desired.

Other objects and advantages of the invention will be set forth in the following description and explanation.

In the accompanying drawing which serves to illustrate an embodiment of the invention- F lgure 1 is a view partly in section and partly in elevation of a fragment of the fire box or fire space of a furnace, stove or range, showing a fuel attachment embodying my present invention mounted upon the door thereof and located in position for use.

Fig. 2 is an enlarged plan sectional view taken on line 2-2 of Figs. 1 and 3 looking in the direction indicated by the arrows, and

Fig. 3 is a vertical sectional view taken on line 33 of' Fig. 2 looking in the direction indlcated by the arrows.

Corresponding numerals of reference refer to similar parts throughout the different views of the drawing.

The numeral 5 designates a portion of the front wall of a stove, range or furnace, which may be of the ordinary or any pre ferred construction, but as usual, is provided with a fire box 6 in the lower portion of which is located a grate 7 on which the coal or fuel 8 is placed for consumption through a door way 9 formed in the front wall or portion of the furnace, oven or range.

Mounted on the outer surface of the front wall of the fire box, in the usual manner, is a door 1 which is provided centrally with an opening 11 around which openingis located and secured by means of bolts 12 a flange 13 on the front part of the receiving chamber or box 14 of the attachment, which consists of a horizontally disposed member, which is designated as a whole, by the reference numeral 15 and which is by preference of a size to permit it to pass back and forth through the opening ordoorway 9 in the front wall of the furnace when the door 10 thereof is opened or closed.

As is clearly shown in Figs. 2 and 3 of the drawing, the horizontally disposed member 15 is provided with a conduit or passageway 16 which communicates at its front or one of its ends with the receiving chamber 14 and at its rear or other end with the cavity 17 of the member 15 which is horizontall disposed and may be of any suitable depth or thickness and preferably comprises the major part of the interior area of the member 15, which member is by preference circular in outlines.

The member 15 comprises circular upper and lower spaced apart portions 18 and 19 respectively and a vertical wall 20 which unites them at their peripheries. This wall is provided in that portion thereof opposite the flange 13 and opening 16 with a horizontally disposed segmental opening or slot 21 for the discharge of heated air.

Located within the cavity of the member 15 and near the opening 16 of said member is a baffle plate 22 which is parallel with the flange 13 and extends from theupper portion 18 to the lower portion 19 of the device to which parts it is secured at its upper or lower edges or made integrally therewith. The baffle 22, as shown in Fig. 2 of the drawing terminates a short distance on each side of the opening 16 so that the atmospheric air entering said opening will be deflected against the curved wall 20 and from thence be directed rearwardly of the dev ce.

Located near the ends of the segmental slot 21 between the portions 18 and 19 of the member 15 is a partition 23 which unites the upper and lower portions 18 and 19 respectively of said member and also opposite points of the wall 20 thereof. This parti-- tion is provided at about its middle with an opening 24 through which the heated air in chamber or cavity 17 will pass with considerable force into the expansion chamber 25 formed by the partition 23 and that portion of the member 15 extended rearwardly from said partition.

The application and operation of the device is as follows:

The receiving box or chamber 14 of the horizontally disposed member 15 is secured to the inner surface of the door 10 of the furnace, stove or range, and around the opening 11 therein so that the atmospheric air can pass through said opening in the door and into the box or chamber 14 from whence it will pass into the cavity or chamber 17 in the direction indicated by the arrows in Fig. 2 of the drawing.-

It will be understood that the device is located horizon-tally within the fire box of the furnace and above the fuel on the grate thereof, in about the position shown in Fig. 1 of the drawing, and it is obvious that when the fire is started, and the fuel begins to burn on the grate, the device will become heated and the air therein will become heated and as the heat from the fuel ascends around the device and especially at the rear or inner end thereof, suction at said end will be produced to the end that the air passing through the cavity or chamber 17 will be caused to pass out through. the front or opening 24 with considerable force into the expansion chamber 25 from which it will be discharged and distributed in a fan shaped horizontally disposed volume over the fire on the grate. As the fire increases in intensity, it is obvious that the draft of the fine or chimney of the stove or furnace will cause the heat from the fuel to travel rearwardly and beyond the rear portion of the member 15 in which operation it is obvious that the heated air within the attachment will be discharged through the opening or slot 21 and will be forced rearwardly to commingle with the volatile and combustible gases in the fire box especially at the rear portion of the attachment.

Having thus fully described my invention, what ll claim as new and desire to secure by Letters Patent is- 1. In a fuel saving attachment for furnaces, the combination with a furnace having a combustion chamber and an opening leading thereto, of a centrally apertured door hinged to the furnace to close the opening therein, a member having a receiving chamber-casing mounted around and in communication with said opening in the door and extending within the combustion chamber, said member being substantially flat and horizontally-disposed and provided with a horizontally disposed cavity therein, a bafile plate located within said cavity rearwardly of the receiving chamber, and a centrally orificed partition located in said cavity parallel with said baffle plate and rearwardly thereof, said member having in the inner or rear portion of its wall a horizontally disposed discharging slot.

2. In a fuel saving attachment for furnaces, the combination with a furnace wall having a doorway, of a hinged door therefor, said door having an opening therein leading to the combustion chamber of the furnace, a member having a receiving chamher-casing mounted on the inner surface of the door in communication with the opening therein, said member being horizontally disposed and provided with a horizontally disposed cavity therein, said casing having a reduced conduit leading to said cavity, a baffle plate located within said cavity rearwardly of the receiving chamber, and an orificed partition located in said cavity parallel with said baflle plate and rearwardly thereof, said member having in the inner or front portion of its walla horizontally disposed discharging slot.

3. As a new article of manufacture, a fuel saving attachment for furnaces comprising a member having at its edge a receiving chamber-casing with a reduced outlet and 5 provided with a horizontally disposed cavity in communication with said chambercasing through said outlet, a baffle plate located within said cavity near the receiving chamber, and a centrally orificed partition located in said cavity parallel with said baflle plate thereof, said member having in the inner or front portion of its wall a horizontally disposed discharging slot.

NELSON J. RUSSELL. 

